Located on the Attendance Dates category tab in Search Builder this Condition is designed to use behind the scenes for convert-to-search type of searches. However, if you happen to know the Meeting ID you can enter it in the text box and the search will find everyone who attended that meeting. You can also find these same people by going to the Meeting and selecting Convert to Search > Attendees.
The Meeting ID is in the URL when you are viewing a specific Meeting.
Modify image link with secure protocol.